Which groups of people is bariatric surgery usually advised for?

Which groups of people is bariatric surgery usually advised for? This is all based on the NICE criteria, the National Institute for Care and Health Excellence, and the criteria are as follows. People that are eligible for surgery are those that have a body mass index over 40 without any comorbidities, people who have a body mass index over 35 with significant comorbidities, or people who have a body mass index over 30 with type 2 diabetes, which they have had for less than 10 years.